- Mar 23, 2009After five decades, the search for extraterrestrial intelligence has failed to find any alien signals. SETI researchers are still optimistic that we will one day find evidence for intelligent life somewhere in our galaxy. A new book by SETI scientist, Seth Shostak, reviews the history,
- Nov 2, 2006Vertebrate creatures first began moving from the world's oceans to land about 415 million years ago, then all but disappeared by 360 million years ago. The fossil record contains few examples of animals with backbones for the next 15 million years, and then suddenly vertebrates
- Feb 20, 2006Are there aliens living on Earth? Not the humanoid kind, with big eyes or glowing fingertips. But unfamiliar types of microscopic life, that doesn't use DNA. Geology professor Peter Ward thinks its possible. His new book, Life as We Do Not Know It, explains why.
- Sep 8, 2005The Mars Rovers Spirit and Opportunity are the Energizer Bunnies of planetary exploration. Designed to last for only 90 days, they are still going strong after nearly two years. Their journeys on Mars have provided exquisite detail of the planet's surface, proving definitively